<!DOCTYPE html>
<html>
  <head>
    <style>
      p {
        margin: 8px;
        font-size: 16px;
      }
      .selected {
        color: red;
      }
    </style>
    <script src="https://code.jquery.com/jquery-latest.js"></script>
  </head>
  <body>
    <p>This paragraph is black and is the first paragraph.</p>
    <p class="selected">This paragraph is red and is the second paragraph.</p>

    <div id="result1">First paragraph has selected class:</div>
    <div id="result2">Second paragraph has selected class:</div>
    <div id="result3">At least one paragraph has selected class:</div>
    <script>
      $('div#result1').append($('p:first').hasClass('selected').toString());
      $('div#result2').append($('p:last').hasClass('selected').toString());
      $('div#result3').append($('p').hasClass('selected').toString());
    </script>
  </body>
</html>
